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C#开发给文件加密解密实现代码分享

时间:2015年04月02日 15:28:55    来源:魔法猪系统重装大师官网    人气:7107

西西在网上搜索相关文件加密的程序,发现给出的基本都是针对“字符创”、“文本”的加密与解密。对视频文件、图片等一般文件的加密解密程序少之又少,故写下此文,实现一个对一般文件进行加密的小工具。

  程序的主要功能是:用户通过文件选择框选择要加密的文件-》输入密码进行加密;选择加密后的文件,输入密码进行解密

  程序的主界面如下:

  三个按钮的Click事件处理程序如下

        private void btnSelectFile_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                txtFileName.Text = openFileDialog1.FileName ;
            }
        }

        private void btnEncryptFile_Click(object sender, EventArgs e)
        {
            string inFile=txtFileName.Text;
            string outFile = inFile + ".dat";
            string password=txtPassword.Text ;
            DESFile.DESFileClass.EncryptFile(inFile, outFile, password);//加密文件
            //删除加密前的文件
            File.Delete(inFile);
            txtFileName.Text = string.Empty;
            MessageBox.Show("加密成功");
        }

        private void btnDecryptFile_Click(object sender, EventArgs e)
        {
            string inFile = txtFileName.Text;
            string outFile = inFile.Substring(0,inFile.Length - 4);
            string password = txtPassword.Text;
            DESFile.DESFileClass.DecryptFile (inFile, outFile, password);//解密文件
            //删除解密前的文件
            File.Delete(inFile);
            txtFileName.Text = string.Empty;
            MessageBox.Show("解密成功");
        }

  加密解密的Help文件源码如下:

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;

namespace DESFile
{
    ///


    /// 异常处理类
    ///

    public class CryptoHelpException : ApplicationException
    {
        public CryptoHelpException(string msg) : base(msg) { }
    }

    ///
    /// CryptHelp
    ///

    public class DESFileClass
    {
        private const ulong FC_TAG = 0xFC010203040506CF;

        private const int BUFFER_SIZE = 128 * 1024;

        ///
        /// 检验两个Byte数组是否相同
        ///

        /// Byte数组
        /// Byte数组
        /// true-相等
        private static bool CheckByteArrays(byte[] b1, byte[] b2)
        {
            if (b1.Length == b2.Length)
            {
                for (int i = 0; i < b1.Length; ++i)
                {
                    if (b1[i] != b2[i])
                        return false;
                }
                return true;
            }
            return false;
        }

        ///
        /// 创建DebugLZQ ,http://www.cnblogs.com/DebugLZQ
        ///

        /// 密码
        ///
        /// 加密对象
        private static SymmetricAlgorithm CreateRijndael(string password, byte[] salt)
        {
            PasswordDeriveBytes pdb = new PasswordDeriveBytes(password, salt, "SHA256", 1000);

            SymmetricAlgorithm sma = Rijndael.Create();
            sma.KeySize = 256;
            sma.Key = pdb.GetBytes(32);
            sma.Padding = PaddingMode.PKCS7;
            return sma;
        }

        ///
        /// 加密文件随机数生成
        ///

        private static RandomNumberGenerator rand = new RNGCryptoServiceProvider();

        ///
        /// 生成指定长度的随机Byte数组
        ///

        /// Byte数组长度
        /// 随机Byte数组
        private static byte[] GenerateRandomBytes(int count)
        {
            byte[] bytes = new byte[count];
            rand.GetBytes(bytes);
            return bytes;
        }

        ///
        /// 加密文件
        ///

        /// 待加密文件
        /// 加密后输入文件
        /// 加密密码
        public static void EncryptFile(string inFile, string outFile, string password)
        {
            using (FileStream fin = File.OpenRead(inFile),
                fout = File.OpenWrite(outFile))
            {
                long lSize = fin.Length; // 输入文件长度
                int size = (int)lSize;
                byte[] bytes = new byte[BUFFER_SIZE]; // 缓存
                int read = -1; // 输入文件读取数量
                int value = 0;

                // 获取IV和salt
                byte[] IV = GenerateRandomBytes(16);
                byte[] salt = GenerateRandomBytes(16);

                // 创建加密对象
                SymmetricAlgorithm sma = DESFileClass.CreateRijndael(password, salt);
                sma.IV = IV;

                // 在输出文件开始部分写入IV和salt
                fout.Write(IV, 0, IV.Length);
                fout.Write(salt, 0, salt.Length);

                // 创建散列加密
                HashAlgorithm hasher = SHA256.Create();
                using (CryptoStream cout = new CryptoStream(fout, sma.CreateEncryptor(), CryptoStreamMode.Write),
                    chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write))
                {
                    BinaryWriter bw = new BinaryWriter(cout);
                    bw.Write(lSize);

                    bw.Write(FC_TAG);

                    // 读写字节块到加密流缓冲区
                    while ((read = fin.Read(bytes, 0, bytes.Length)) != 0)
                    {
                        cout.Write(bytes, 0, read);
                        chash.Write(bytes, 0, read);
                        value += read;
                    }
                    // 关闭加密流
                    chash.Flush();
                    chash.Close();

                    // 读取散列
                    byte[] hash = hasher.Hash;

                    // 输入文件写入散列
                    cout.Write(hash, 0, hash.Length);

                    // 关闭文件流
                    cout.Flush();
                    cout.Close();
                }
            }
        }

        ///
        /// 解密文件
        ///

        /// 待解密文件
        /// 解密后输出文件
        /// 解密密码
        public static void DecryptFile(string inFile, string outFile, string password)
        {
            // 创建打开文件流
            using (FileStream fin = File.OpenRead(inFile),
                fout = File.OpenWrite(outFile))
            {
                int size = (int)fin.Length;
                byte[] bytes = new byte[BUFFER_SIZE];
                int read = -1;
                int value = 0;
                int outValue = 0;

                byte[] IV = new byte[16];
                fin.Read(IV, 0, 16);
                byte[] salt = new byte[16];
                fin.Read(salt, 0, 16);

                SymmetricAlgorithm sma = DESFileClass.CreateRijndael(password, salt);
                sma.IV = IV;

                value = 32;
                long lSize = -1;

                // 创建散列对象, 校验文件
                HashAlgorithm hasher = SHA256.Create();

                using (CryptoStream cin = new CryptoStream(fin, sma.CreateDecryptor(), CryptoStreamMode.Read),
                    chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write))
                {
                    // 读取文件长度
                    BinaryReader br = new BinaryReader(cin);
                    lSize = br.ReadInt64();
                    ulong tag = br.ReadUInt64();

                    if (FC_TAG != tag)
                        throw new CryptoHelpException("文件被破坏");

                    long numReads = lSize / BUFFER_SIZE;

                    long slack = (long)lSize % BUFFER_SIZE;

                    for (int i = 0; i < numReads; ++i)
                    {
                        read = cin.Read(bytes, 0, bytes.Length);
                        fout.Write(bytes, 0, read);
                        chash.Write(bytes, 0, read);
                        value += read;
                        outValue += read;
                    }

                    if (slack > 0)
                    {
                        read = cin.Read(bytes, 0, (int)slack);
                        fout.Write(bytes, 0, read);
                        chash.Write(bytes, 0, read);
                        value += read;
                        outValue += read;
                    }

                    chash.Flush();
                    chash.Close();

                    fout.Flush();
                    fout.Close();

                    byte[] curHash = hasher.Hash;

                    // 获取比较和旧的散列对象
                    byte[] oldHash = new byte[hasher.HashSize / 8];
                    read = cin.Read(oldHash, 0, oldHash.Length);
                    if ((oldHash.Length != read) || (!CheckByteArrays(oldHash, curHash)))
                        throw new CryptoHelpException("文件被破坏");
                }

                if (outValue != lSize)
                    throw new CryptoHelpException("文件大小不匹配");
            }
        }
    }
}

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栏目:电脑教程 阅读:1000 2023/12/27
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